i took the timing chain and gear off today to clean it upo and i noticed theres some slack in the timing chain idler gear, it moves say 2-3mm from side to side but does not have any slack up and down,,, im pretty sure this connects to the dizzy and oil pump

there is no bearing on the AUX shaft and either end. if there is play like you describe, the block is worn. It will also be causing misalignment of the dizzy drive gear. this is a big deal and the oil pump is driven from the bottom of the dizzy shaft. and it take a fair bit of power to drive the oil pump. (a large electric drill will struggle to turn it over enough to make 15psi)

you really need to remove the AUX shaft to determine if it the end of the world. IF the block is worn it would mean stripping and boring over size and then having a bush made for it. It would be cheaper to get a other engine.

The EF timing cover and sump will fit the AU block for a straight fit.Or mod the front of the AU sump to clear the k frame.

EF/EL Sump 'WILL NOT FIT AU ENGINE'. Why do you think people pay $120 plus to have a sump modified of modify their K Fame to fit an AU Engine to their EF/EL's if an EF/EL sump would fit. AU sump won't fit and that means that the Timing Case won't fit either.

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